1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  */
  4 
  5 /**@constructor*/
  6 THREE.SphereGeometry = function ( radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength ) {
  7 
  8 	THREE.Geometry.call( this );
  9 
 10 	this.radius = radius || 50;
 11 
 12 	this.widthSegments = Math.max( 3, Math.floor( widthSegments ) || 8 );
 13 	this.heightSegments = Math.max( 2, Math.floor( heightSegments ) || 6 );
 14 
 15 	phiStart = phiStart !== undefined ? phiStart : 0;
 16 	phiLength = phiLength !== undefined ? phiLength : Math.PI * 2;
 17 
 18 	thetaStart = thetaStart !== undefined ? thetaStart : 0;
 19 	thetaLength = thetaLength !== undefined ? thetaLength : Math.PI;
 20 
 21 	var x, y, vertices = [], uvs = [];
 22 
 23 	for ( y = 0; y <= this.heightSegments; y ++ ) {
 24 
 25 		var verticesRow = [];
 26 		var uvsRow = [];
 27 
 28 		for ( x = 0; x <= this.widthSegments; x ++ ) {
 29 
 30 			var u = x / this.widthSegments;
 31 			var v = y / this.heightSegments;
 32 
 33 			var vertex = new THREE.Vector3();
 34 			vertex.x = - this.radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
 35 			vertex.y = this.radius * Math.cos( thetaStart + v * thetaLength );
 36 			vertex.z = this.radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
 37 
 38 			this.vertices.push( vertex );
 39 
 40 			verticesRow.push( this.vertices.length - 1 );
 41 			uvsRow.push( new THREE.UV( u, 1 - v ) );
 42 
 43 		}
 44 
 45 		vertices.push( verticesRow );
 46 		uvs.push( uvsRow );
 47 
 48 	}
 49 
 50 	for ( y = 0; y < this.heightSegments; y ++ ) {
 51 
 52 		for ( x = 0; x < this.widthSegments; x ++ ) {
 53 
 54 			var v1 = vertices[ y ][ x + 1 ];
 55 			var v2 = vertices[ y ][ x ];
 56 			var v3 = vertices[ y + 1 ][ x ];
 57 			var v4 = vertices[ y + 1 ][ x + 1 ];
 58 
 59 			var n1 = this.vertices[ v1 ].clone().normalize();
 60 			var n2 = this.vertices[ v2 ].clone().normalize();
 61 			var n3 = this.vertices[ v3 ].clone().normalize();
 62 			var n4 = this.vertices[ v4 ].clone().normalize();
 63 
 64 			var uv1 = uvs[ y ][ x + 1 ].clone();
 65 			var uv2 = uvs[ y ][ x ].clone();
 66 			var uv3 = uvs[ y + 1 ][ x ].clone();
 67 			var uv4 = uvs[ y + 1 ][ x + 1 ].clone();
 68 
 69 			if ( Math.abs( this.vertices[ v1 ].y ) === this.radius ) {
 70 
 71 				this.faces.push( new THREE.Face3( v1, v3, v4, [ n1, n3, n4 ] ) );
 72 				this.faceVertexUvs[ 0 ].push( [ uv1, uv3, uv4 ] );
 73 
 74 			} else if ( Math.abs( this.vertices[ v3 ].y ) === this.radius ) {
 75 
 76 				this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
 77 				this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );
 78 
 79 			} else {
 80 
 81 				this.faces.push( new THREE.Face4( v1, v2, v3, v4, [ n1, n2, n3, n4 ] ) );
 82 				this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3, uv4 ] );
 83 
 84 			}
 85 
 86 		}
 87 
 88 	}
 89 
 90 	this.computeCentroids();
 91 	this.computeFaceNormals();
 92 
 93 	this.boundingSphere = { radius: this.radius };
 94 
 95 };
 96 
 97 THREE.SphereGeometry.prototype = Object.create( THREE.Geometry.prototype );
 98 

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